The building is a unit social housing complex in a seven-story reinforced concrete structure, with steel stud infill walls and commercial space on the first floor. This method holds good for white and brightly coloured plain fabrics. During sewing operation, bottom layer fabric is moved forward by feed dog positively. Again, this shows that boards have not shrunk in the width dimension. Second method employs the difference in length of fabric due to pucker as an indicator. They defined five shape parameters for objective measurement including number of random wave generating points, wave amplitude at seam line and edge line, wave length at seam line and edge.
But they did not receive much attention and acceptance from apparel industries due to certain limitations. Using sophisticated sensors placed on different floors, building position on the south and north facades of the building were measured. These scanners measure the height of the seam at various points of the seam and a seam profile is obtained. Apply shrinmage visual check — Does the pucker appear shrinkzge treatment or washing?
If both faces of the seam revert to a smooth surface, structural jamming has occurred.
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If the foot pressure on the machine is too high, excessive friction can stretch the top ply. The fabric is illuminated by a grid of parallel light source at perpendicular to fabric plane. Consequently, system has been designed with help of moving stages to measure the height at various points of the seam Inui and Shibuya, The means of the two traces were used for final assessment.
Threads made of cotton and other natural fibres often shrink, when wet. When the operator stretches one ply more shirnkage the other as they are fed into the machine.
Based on this cognitive theory descriptors were developed for grading. Different shrinkage of plies of fabric causes seam pucker that is visible only after few washing cycles.
Seam Pucker in Apparels: A Critical Review of Evaluation Methods – SciAlert Responsive Version
The laser displacement meter can measure the height of weams single point at a time. The number of cubes that intersect the fabric surface is calculated. The increase in thickness can be sezms as an indicator of the extent of puckering:. The first case is an examination of test wall assemblies after five years of test exposure in a climate research laboratory. This can distort the fabric. Thus movement to top fabric is not a positive one.
Tension Pucker Occurs due to: This is inevitable from the point of view of sewing operation, which requires higher needle thread tension than bobbin thread tension to snatch the later for stitch formation. Method shrinkabe evaluating seam pucker. The predictions based on this instrument are highly unrealistic and reliability of the instrument is poor.
Several board joints were included in each sample to measure shinkage performance of the taped joints used as a weather resistive barrier WRB. Sewing thread extends due to very high tension, afterwards attempts to relax.
Review Article Seam Pucker in Apparels: Case of the measurement of seam pucker level. In less severe cases, the wave formation is less pronounced, but nevertheless shrinnkage. They defined five shape parameters for objective measurement including number of random wave generating points, wave amplitude at seam line and edge line, wave length at seam line and edge.
Make two cuts across the seam, and then remove all sewing threads between the cuts. This kind of pucker is visible in both sides of the fabric. Incorrect timing may lead to an imbalanced stitch. Fabric yarns attempt to return to original position and they are prevented from doing so by the sewing threads. Two quantitative measures were proposed:. A Critical Review of Evaluation Methods. The tilt and curvature of the seam was excluded by the filter which removed wavelength higher than 60 mm.